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1,728
texts
167
audio
113
movies
30
images
3
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2
web
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Topics & Subjects
567
Engineers
397
ENGINEERS
397
ERIC Archive
348
NASA Technical Reports Server (NTRS)
218
Scientists
209
DTIC Archive
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Collection
466
American Libraries
397
Education Resources Information Center (ERIC) Archive
348
NASA Network Resource and Training Site
148
Community Audio
136
Defense Technical Information Archive
94
California Digital Library
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Creator
397
eric
348
nasa technical reports server (ntrs)
209
defense technical information center
58
9/11 free fall
35
united states. army. corps of engineers
30
keith, hastings, 1915-2005
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Language
1,711
English
12
French
9
Italian
6
Russian
5
German
5
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